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Analog Devices Inc./Maxim Integrated MAX6425UK16+
- Part No.:
- MAX6425UK16+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK16+.pdf
- Description:
- MAX6425 LOW-POWER, SOT MICROPROC
- Quantity:
- Payment:
- Shipping:
Inventory:2,013
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Product details
Overview
MAX6425UK16+ from Maxim Integrated is a low-power microprocessor supervisor IC that monitors 1.575V system supply voltage and asserts an active-low open-drain RESET signal during brownout, power-up, or power-down events. It features capacitor-adjustable reset timeout (275µs minimum), guaranteed operation down to VCC = 1V, and consumes only 1.6µA typical quiescent current. It is used in battery-powered controllers and portable medical instrumentation for reliable µP initialization.
For engineers reviewing the MAX6425UK16+ datasheet, MAX6425UK16+ pinout, MAX6425UK16+ application, or MAX6425UK16+ equivalent, key selection criteria include its 1.575V factory-trimmed reset threshold, SOT23-5 open-drain output architecture, capacitor-programmable timeout delay, and -40°C to +125°C operating range.
Technical Context
The MAX6425UK16+ implements a precision bandgap-based voltage detector with ±1.5% reset threshold accuracy at +25°C and ±2.5% over full temperature range. Its internal 240nA current source charges an external capacitor on the SRT pin to generate a programmable timeout period governed by tRP = 2.73×10⁶ × CSRT + 275µs.
It uses BiCMOS process technology (295 transistors) and features immunity to short VCC transients - e.g., a 100mV undershoot lasting ≤50µs typically does not trigger reset. The open-drain RESET output supports logic-level translation via external pullup to any supply from 0V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V nominal (suffix "16"), ±1.5% at +25°C - ensures accurate brownout detection for 1.6V–1.8V logic rails |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on portable systems |
| Reset Timeout | 275µs minimum (CSRT = 0); adjustable up to >10ms with external capacitor - matches µP reset hold requirements |
| Operating Voltage | 1.0V to 5.5V supply range - guarantees valid RESET assertion even during deep brownout |
| Output Type | Active-low open-drain - allows wired-OR reset combining and interface to mixed-voltage µPs |
| Temp Range | -40°C to +125°C - qualified for automotive under-hood and industrial embedded environments |
| Package | 5-pin SOT23-5 - surface-mount footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6425UK16+ is housed in a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and available in lead-free (+T) variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Set Reset Timeout Input | Connects to external timing capacitor; internal 240nA current source ramps voltage to 0.65V to define timeout period |
| 2 - GND | Ground Reference | Primary return path for internal circuitry and SRT capacitor discharge; must be low-impedance |
| 3 - GND | Ground Reference | Second ground terminal for improved noise immunity and thermal dissipation in SOT23-5 layout |
| 4 - VCC | Supply & Threshold Monitor | Monitored input for reset generation; also powers internal circuitry; valid operation down to 1.0V |
| 5 - RESET | Open-Drain Reset Output | Active-low output requiring external pullup; sinks ≥50µA at VCC ≥ 1.0V; compatible with 0–5.5V logic domains |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable timeout | Enables precise matching to µP reset hold time across diverse applications without changing IC |
| 1.6µA quiescent current | Reduces standby power in battery-critical devices such as handheld medical sensors and IoT edge nodes |
| Open-drain RESET output | Supports multi-source reset arbitration (wired-OR) and level-shifting to non-VCC logic supplies |
| Valid RESET to VCC = 1V | Ensures deterministic µP reset state during deep undervoltage conditions where most supervisors fail |
| Immunity to 50µs/100mV transients | Prevents false resets caused by switching noise or ESD-induced supply glitches |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor with coin-cell battery and ultra-low-power MCU. IC Role / Device Role / Timing Role: Monitors 1.8V rail; asserts open-drain RESET until stable power is confirmed and timeout expires. Use Value: Prevents firmware corruption during cold-start or battery sag using <1.6µA overhead and 1.575V threshold aligned to sensor analog front-end. | Use Scenario: Door module with LIN interface and 12V-to-3.3V DC/DC converter. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply; provides reset hold time synchronized to DC/DC soft-start. Use Value: Guarantees clean boot after load-dump transients using transient-immune detection and -40°C to +125°C qualification. |
| Portable Industrial Data Loggers | Smart Energy Meters |
Use Scenario: Ruggedized field logger powered by rechargeable Li-ion with intermittent solar charging. IC Role / Device Role / Timing Role: Detects 1.6V brownout on MCU core rail; holds RESET low until capacitor-charged timeout completes. Use Value: Eliminates partial-execution crashes during intermittent power loss using programmable timeout and sub-2µA sleep current. | Use Scenario: DIN-rail meter with isolated RS-485 and real-time clock backup. IC Role / Device Role / Timing Role: Supervises 3.3V RTC and communication IC supply; open-drain output tied to shared reset bus. Use Value: Enables coordinated system reset across multiple voltage domains via pullup to 5V or 3.3V, supporting legacy and new peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN16T1G | Fixed 1.6V threshold; no capacitor-adjustable timeout; push-pull output; 1.1µA ICC | Lacks timeout flexibility and open-drain drive; requires redesign if wired-OR or level-shift needed | Select when minimal BOM count and lowest quiescent current outweigh timeout programmability |
| TLV803EB16DBZR | 1.6V threshold; fixed 200ms timeout; open-drain output; 0.5µA ICC; SOT23-3 package | Non-adjustable timeout limits µP compatibility; smaller 3-pin footprint but no SRT pin for tuning | Choose for space-constrained designs where fixed delay suffices and 0.5µA ICC is critical |
Compared with NCP302LSN16T1G and TLV803EB16DBZR, MAX6425UK16+ uniquely combines factory-trimmed 1.575V detection, capacitor-programmable timeout, open-drain output, and guaranteed 1V operation - making it optimal for applications demanding both precision brownout response and flexible reset timing.
Availability
MAX6425UK16+ is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and portable industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6425UK16+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6340/MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for systems where supply stability, battery longevity, and brownout resilience are critical.
FAQ
What is the exact reset threshold voltage of MAX6425UK16+?
The MAX6425UK16+ has a factory-trimmed nominal reset threshold of 1.575V, with tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is defined by the "16" suffix per Table 1 in the datasheet and is laser-trimmed for accuracy.
Does MAX6425UK16+ support capacitor-programmable reset timeout, and how is it calculated?
Yes, MAX6425UK16+ supports capacitor-programmable reset timeout via the SRT pin. The timeout period is calculated as tRP = 2.73 × 10⁶ × CSRT + 275µs, where CSRT is in farads and tRP in seconds. A 1500pF capacitor yields ~4.375ms timeout, as verified in Typical Operating Characteristics.
What is the output configuration of MAX6425UK16+, and what pullup resistor value is recommended?
MAX6425UK16+ features an active-low open-drain RESET output. A 10kΩ to 100kΩ external pullup resistor is recommended - selected to ensure logic-high recognition while sinking required current (≥50µA) when RESET is asserted. Pullup voltage may be any supply from 0V to 5.5V.
Can MAX6425UK16+ operate reliably when VCC drops below 1.6V?
Yes, MAX6425UK16+ guarantees valid RESET assertion down to VCC = 1.0V, and its internal circuitry remains functional through brownout. However, RESET output sink capability degrades below 1.0V; for VCC = 0 operation, a 100kΩ pulldown resistor is recommended to maintain low state.
Is MAX6425UK16+ pin-compatible with other members of the MAX642x family?
Yes, MAX6425UK16+ shares identical 5-pin SOT23-5 pinout with MAX6340, MAX6424, and MAX6426. All use pins 1(SRT), 2(GND), 3(GND), 4(VCC), 5(RESET). This enables drop-in replacement within the same output-type group (open-drain variants).
MAX6425UK16+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 3ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6425UK16+ FAQ
1.How can I place an order for MAX6425UK16+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK16+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6425UK16+ reliable?
The price and inventory of MAX6425UK16+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK16+ is usually 5 days.
3.What payment methods are accepted for MAX6425UK16+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK16+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK16+?
MAX6425UK16+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK16+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6425UK16+?
For technical support, including MAX6425UK16+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK16+ requirements.
6.How does Aetrix verify that MAX6425UK16+ is sourced from the original manufacturer or authorized distributors?
All MAX6425UK16+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6425UK16+ meets industry standards.
7.What is the process for return or replacement of MAX6425UK16+?
All MAX6425UK16+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK16+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6425UK16+ part is unused and in its original packaging.
Return procedure for MAX6425UK16+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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